Question

f the wheel on a car accelerates from rest at a constant rate of 1.5 rev/s², how fast will it be turning after 3 s?

Select one:

a. 1.5 rev/s

b. 2 rev/s

c. 3 rev/s

d. 4.5 rev/s

Answer 1

Using:

$\alpha =\frac{\Delta\omega }{\Delta t}$

Where

$\alpha$ is angular acceleration

$\Delta \omega$ = Change in angular velocity

$\Delta t$ = Change in time

Substituing values

1.5 = (v - 0) / 3

Where v is final angualr velocity after 3s

v = 4.5 rev/s

Hence answer is d